Leon, simply because its an evolution engineering wise, compared to the Toledo.
As Plato said, the Toledo was a good car but the chassis wasn't great, and even a race car is still engineered on the road car its homologated from.
The Leon has a more balanced chassis, and is a fantastic race car through the twisties. As a hatchback it can suffer from lack of straightline speed. However nothing is ever perfect.
Toledo is a good race car, and Motorbase are proving its still got life in it. But as a race car the Leon is the better engineered and the more competitive.